Thursday, October 29, 2009

Figure 1: Cross-sectional anatomy of the airway from mouth to alveoli. Structures located above the chest cavity compose the upper airway. Those structures within the chest cavity are considered part of the lower airway.

Stridor is a noise heard on inspiration and is caused by the narrowing of the extrathoracic upper airway.

In extrathoracic obstruction, pressure distal to the point of obstruction will become -ve in order to overcome the airway resistance. Thus, the airways will collapse. So, during the inspiration, there will be increase in turbulence of air moving through the obstructed airways. Thus, this produces audible sound during inspiration called STRIDOR.

Wheezing is a whistling-like sound and is caused by the narrowing of the intrathoracic airway.

In intrathoracic airway obstruction, intrapleural pressure will become more positive during expiration because of the air trapped inside. So, there will be collapse of the intrathoracic airways. When air is expired out, it will pass through this collapsed airways. Thus, producing WHEEZING sound during expiration.

Waktu Solat

Who are you?

"I am a traveler seeking the truth, a human searching for the meaning of humanity and a citizen seeking dignity, freedom, stability and welfare under the shade of Islam. I am a free man who is aware of the purpose of his existence and who proclaims: “Truly, my prayer and my sacrifice, my living and my dying are all for Allah, the Lord of the worlds; no partner has He. This, am I commanded and I am of those who submit to His Will.” This is who I am. Who are you?"